Hip Hop math

Baltimore Sun file photo

Sixth-graders in 2007 at KIPP Ujima Village Academy, a high-performing charter school in the city. The school recently cut its hours because of conflicts with its teachers union contract. Proposed state changes include letting teachers opt out of the union.

Sixth-graders in 2007 at KIPP Ujima Village Academy, a high-performing charter school in the city. The school recently cut its hours because of conflicts with its teachers union contract. Proposed state changes include letting teachers opt out of the union. (Baltimore Sun file photo)

Sixth-graders in 2007 at KIPP Ujima Village Academy, a high-performing charter school in the city. The school recently cut its hours because of conflicts with its teachers union contract. Proposed state changes include letting teachers opt out of the union.